\documentclass{article}
\usepackage{booktabs}
\begin{document}
	\begin{table}[!htbp]
		\centering
		\caption{Comparison of percentages.}
		\begin{tabular}{*5c}
			\toprule
			Mode &  \multicolumn{2}{c}{Var} & \multicolumn{2}{c}{Cum}\\
			\midrule
			{}   & EF   & CHF    & EF2   & CHF2\\
			1   &  17.5 & 19.1   & 17.5  & 19.1\\
			2   &  11.8 & 12.7   & 29.3  & 31.9\\
			3   &  6.6  &  5.6   & 35.9  & 37.4\\
			\bottomrule
		\end{tabular}
	\end{table}
\end{document}